<template>
	<div class="login_container">
		<div class="login_box">
			<!-- 头像区域 -->
			<div class="avatar_box">
				<img src="../assets/logo.png" alt="">
			</div>
			<!-- 登录表单区域 -->
			<el-form ref="loginRef" :model="loginForm" :rules="loginRules" label-width="0px"class="login_form">
				<!-- 用户名 -->
			  <el-form-item prop="username">
			    <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
			  </el-form-item>
			  <!-- 密码 -->
			  <el-form-item prop="password">
			    <el-input v-model="loginForm.password" prefix-icon="el-icon-unlock" type="password"></el-input>
			  </el-form-item>
			  <!-- 按钮 -->
			  <el-form-item class="btns">
			     <el-button type="primary" @click="login">登录</el-button>
				  <el-button type="info" @click="reset" >重置</el-button>
			  </el-form-item>
			</el-form>
		</div>
	</div>
</template>

<script>
	export default {
		data(){
			return{
				//这是登录表单的数据绑定对象
				loginForm:{
					username:'admin',
					password:'123456',
				},
				//这是表单的验证规则对象
				loginRules:{
					//验证用户名是否合法
					username:[
						{ required: true, message: '请输入登录名称', trigger: 'blur' },
						{ min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
					],
					//验证密码是否合法
					password:[
						{ required: true, message: '请输入登录密码', trigger: 'blur' },
						{ min: 6, max: 15, message: '长度在 6 到 15个字符', trigger: 'blur' }
					]
				}
			};
		},
		methods:{
			//点击重置按钮，重置登录
			reset(){
				//console.log(this)
				this.$refs.loginRef.resetFields();
			},
			login(){
				this.$refs.loginRef.validate(async valid =>{
					if(!valid) return;
					const {data: res} = await this.$http.post("login",this.loginForm);
					//console.log(res);
				    if(res.meta.status !==200)return this.$message.error("登录失败!");
					this.$message.success("登录成功!");
					//1、将登录成功后的token保存到客户端的sessionStorage中
					//  1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
					//  1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
					//console.log(res);
					window.sessionStorage.setItem("token",res.data.token);
					//2、通过编程式导航跳转到后台主页，路由地址是/home
					this.$router.push('/home');
				});			
			}
		}
	};
</script>

<style>
	.login_container {
		background-color: #2b4b6b;
		height: 100%;
	}

	.login_box {
		width: 450px;
		height: 300px;
		background-color: #fff;
		border-radius: 3px;
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%, -50%);

	}

	.login_box .avatar_box {
		height: 100px;
		width: 100px;
		border: 1px solid #eee;
		border-radius: 50%;
		padding: 10px;
		box-shadow: 0 0 10px #ddd;
		position: absolute;
		left: 50%;
		transform: translate(-50%, -50%);
		background-color: #fff;
	}

	.avatar_box img {
		width: 100px;
		height: 100px;
		border-radius: 50%;
		background-color: #eee;
	}
	
	.login_form{
		position: absolute;
		bottom: 0;
		width: 100%;
		padding: 0 20px;
		box-sizing: border-box;
	}
	
	.btns{
		display: flex;
		 justify-content: flex-end;
	}
</style>
